Setup of 120G and Sump

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Hey everyone, I'm finally getting around to working on my 120G setup and have started building the sump/refug today. I've got a 30G tank for this that will need one side (half) for the pump/skimmer and the other half for the inlet and refugium.

Here is a pic of my plan. The intake on left I'll build a corner chamber similar to the tube shown to help bubble trap and fill with coral rubble. Then the majority of the left side will be a refugium overflowing to the right side. The right pumps back to two spots (the tank obviously and Teed back into the refugium with a ball value so I can reduce the flow up to the tank to keep things quieter. The skimmer is completely within the right had side (I may need to bubble trap that as well).

But I have a few questions.

1. Is it OK to have all the flow through the refugium or should it be fed just off the skimmer output or something so the flow is less and all other flow in the right hand side including the inlet from tank.

2. Do you only need the two baffles like I showed for decent bubble trap or would three be needed?

3. Should the refugium water level be the full height almost and only having room for (power outage) overflow on the right side? Eventually, I may try to add auto top off then also which will be level switched from the right side.

Thanks for any ideas.